clang/test/CodeGen/alias.cpp

   1 // RUN: %clang_cc1 -triple x86_64-linux -verify -emit-llvm-only -DERR %s
   2 // RUN: not %clang_cc1 -triple x86_64-linux -emit-llvm-only -fdiagnostics-parseable-fixits -DERR %s 2>&1 | FileCheck %s --check-prefix=FIXIT
   3 // RUN: %clang_cc1 -triple x86_64-linux -emit-llvm %s -o - | FileCheck %s
   4
   5 #ifdef ERR
   6 void *f1_ifunc(void) { return nullptr; }
   7 void f1(void) __attribute__((alias("f1_ifunc")));
   8 // expected-error@-1 {{alias must point to a defined variable or function}}
   9 // expected-note@-2 {{must refer to its mangled name}}
  10 // expected-note@-3 {{function by that name is mangled as}}
  11 // FIXIT: fix-it:"{{.*}}":{[[@LINE-4]]:30-[[@LINE-4]]:47}:"alias(\"_Z8f1_ifuncv\")"
  12
  13 void *f6_resolver_resolver(void) { return 0; }
  14 void *f6_resolver(void) __attribute__((alias("f6_resolver_resolver")));
  15 // expected-error@-1 {{alias must point to a defined variable or function}}
  16 // expected-note@-2 {{must refer to its mangled name}}
  17 // expected-note@-3 {{function by that name is mangled as}}
  18 // FIXIT: fix-it:"{{.*}}":{[[@LINE-4]]:40-[[@LINE-4]]:69}:"alias(\"_Z20f6_resolver_resolverv\")"
  19 void f6(void) __attribute__((alias("f6_resolver")));
  20 // expected-error@-1 {{alias must point to a defined variable or function}}
  21 // expected-note@-2 {{must refer to its mangled name}}
  22 // expected-note@-3 {{function by that name is mangled as}}
  23 // FIXIT: fix-it:"{{.*}}":{[[@LINE-4]]:30-[[@LINE-4]]:50}:"alias(\"_Z11f6_resolverv\")"
  24
  25 __attribute__((unused, alias("resolver"), deprecated("hahahaha, isn't C great?")))
  26 void func();
  27 // expected-error@-2 {{alias must point to a defined variable or function}}
  28 // expected-note@-3 {{must refer to its mangled name}}
  29
  30 void *operator new(unsigned long) __attribute__((alias("A"))); // expected-error {{alias must point to a defined variable or function}} \
  31                                                                // expected-note {{the function or variable specified in an alias must refer to its mangled name}}
  32 #endif
  33
  34 // CHECK: @_ZN4libc4log2Ed ={{.*}} alias double (double), ptr @log2
  35 // CHECK: define{{.*}} @log2(
  36 namespace libc { double log2(double x); }
  37 extern "C" double log2(double);
  38 namespace std { using ::log2; }
  39 using std::log2;
  40
  41 namespace libc {
  42 decltype(libc::log2) __log2_impl__ __asm__("log2");
  43 decltype(libc::log2) log2 [[gnu::alias("log2")]];
  44 double __log2_impl__(double x) { return x; }
  45 }